1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* $OpenBSD: re.c,v 1.10 2003/06/11 23:42:12 deraadt Exp $ */
/* $NetBSD: re.c,v 1.14 1995/03/21 09:04:48 cgd Exp $ */
/* re.c: This file contains the regular expression interface routines for
the ed line editor. */
/*-
* Copyright (c) 1993 Andrew Moore, Talke Studio.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char *rcsid = "@(#)re.c,v 1.6 1994/02/01 00:34:43 alm Exp";
#else
static char rcsid[] = "$OpenBSD: re.c,v 1.10 2003/06/11 23:42:12 deraadt Exp $";
#endif
#endif /* not lint */
#include "ed.h"
extern int patlock;
char errmsg[MAXPATHLEN + 40] = "";
/* get_compiled_pattern: return pointer to compiled pattern from command
buffer */
pattern_t *
get_compiled_pattern(void)
{
static pattern_t *exp = NULL;
char *exps;
char delimiter;
int n;
if ((delimiter = *ibufp) == ' ') {
seterrmsg("invalid pattern delimiter");
return NULL;
} else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter) {
if (!exp)
seterrmsg("no previous pattern");
return exp;
} else if ((exps = extract_pattern(delimiter)) == NULL)
return NULL;
/* buffer alloc'd && not reserved */
if (exp && !patlock)
regfree(exp);
else if ((exp = (pattern_t *) malloc(sizeof(pattern_t))) == NULL) {
perror(NULL);
seterrmsg("out of memory");
return NULL;
}
patlock = 0;
if ((n = regcomp(exp, exps, 0)) != 0) {
regerror(n, exp, errmsg, sizeof errmsg);
free(exp);
return exp = NULL;
}
return exp;
}
/* extract_pattern: copy a pattern string from the command buffer; return
pointer to the copy */
char *
extract_pattern(int delimiter)
{
static char *lhbuf = NULL; /* buffer */
static int lhbufsz = 0; /* buffer size */
char *nd;
int len;
for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
switch (*nd) {
default:
break;
case '[':
if ((nd = parse_char_class(++nd)) == NULL) {
seterrmsg("unbalanced brackets ([])");
return NULL;
}
break;
case '\\':
if (*++nd == '\n') {
seterrmsg("trailing backslash (\\)");
return NULL;
}
break;
}
len = nd - ibufp;
REALLOC(lhbuf, lhbufsz, len + 1, NULL);
memcpy(lhbuf, ibufp, len);
lhbuf[len] = '\0';
ibufp = nd;
return (isbinary) ? NUL_TO_NEWLINE(lhbuf, len) : lhbuf;
}
/* parse_char_class: expand a POSIX character class */
char *
parse_char_class(char *s)
{
int c, d;
if (*s == '^')
s++;
if (*s == ']')
s++;
for (; *s != ']' && *s != '\n'; s++)
if (*s == '[' && ((d = *(s+1)) == '.' || d == ':' || d == '='))
for (s++, c = *++s; *s != ']' || c != d; s++)
if ((c = *s) == '\n')
return NULL;
return (*s == ']') ? s : NULL;
}
|
